Devices for perfuming ambient air and enclosed spaces
US4634614A · kind A · utility
66Cited by
10References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 13, 1984 |
| Grant date | Jan 6, 1987 |
| Priority date | — |
| Expiry date | Sep 13, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/239
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A device for perfuming ambient air or closed locals comprises a chamber having at least one polymer wall allowing the diffusion of active odoriferous substance vapors into the environning medium, the polymer wall being covered with a thin layer of paper coated with a polymer sheet to which adheres a protection sheet which is impervious to the active substance vapors. Such a device has the advantage of providing for the preservation of the active substance without any loss during prolonged periods of time before use.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.